Duplicate HMD display on primary monitor, with eyetracking info

[performlabrit]

Simple question, followed long explanation that should make this thread helpful to users of HMDs. Especially those that use eye trackers.

Simple question: How do I copy the contents of scene 1 into scene 2? Note that I will want to make additions to scene 2 that will not effect scene 1. I hope there is a computationally efficient solution.

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Here's the long version:

I use eye trackers and HMDs. I want to duplicate the HMD display on a monitor that can be viewed by the experimenter. Note that HMDs require distorting the render account for the helmet optics/geometry. I do not want this distortion on the experimenter's display.

I also want to add additional information to the experimenter display (for example, the point of regard from an eyetracker).

I've made some progress already. I span a window across both displays, splitting the window into 2 views, view 1 on display 1 (experimenter) and view 2 on display 2 (HMD). The HMD display will display the root scene. The Exp display will show a copy, with some changes.

Note that, in my current setup with an NVIS SX111, I actually render across 2 displays for the HMD, and only want the EXP display to copy the left eye. For this reason, I improt the NVIS SX111 module, and multiple the width of the window by 2:

So, that's this code:

# In extend()
viz.MainWindow.setSize([monitorSizes_m[hmdMon][0]*2, monitorSizes_m[hmdMon][1]], mode=viz.WINDOW_PIXELS)
# after viz.go()
import nvis
hmd = nvis.nvisorSX111()

This had made things just a bit more complicated. I hope to switch entirely to the Oculus DKII as soon as an eye-tracker mod is available SMI!?!?)

I'll past my current progress below.
Note that this code draws upon an older thread

def extend(primaryMon = 2,leftEyeMon = 0):
	
	monitors = viz.window.getMonitorList()
	monitorSizes_m = []
	
	for m in monitors:
		monitorSizes_m.append(m.size)
	
	
	ctrlwndw = viz.addWindow()
	# Position ctrlwndw on the primary monitor
	ctrlwndw.setSize(monitorSizes_m[primaryMon], mode=viz.WINDOW_PIXELS)
	ctrlwndw.setPosition(0,monitorSizes_m[primaryMon][1], mode=viz.WINDOW_PIXELS)
	
	ctrlwndw.setScene(viz.Scene2)
	
	viz.MainWindow.setSize([monitorSizes_m[leftEyeMon][0]*2, monitorSizes_m[leftEyeMon][1]], mode=viz.WINDOW_PIXELS)
	viz.MainWindow.setPosition(monitorSizes_m[primaryMon],mode=viz.WINDOW_PIXELS)	
	
	text1 = viz.add(viz.TEXT3D,'HMD',parent=viz.SCREEN,scene=viz.Scene1)
	text2 = viz.add(viz.TEXT3D,'EXP',parent=viz.SCREEN,scene=viz.Scene2)


extend = extend()

viz.add('piazza.osgb')

#viz.window.setFullscreenMonitor([2,1])
viz.go(viz.FULLSCREEN)

import nvis
hmd = nvis.nvisorSX111()

#scene1Children = viz.Scene1.getChildren()
#viz.Scene2.setChildren(scene1Children)